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21-letter words containing r, a, i, n

  • strategic air command — a U.S. Air Force command charged with intercontinental air strikes, especially nuclear attacks.
  • student participation — the extent to which students participate or involve themselves in a class, course, etc
  • subliminal perception — perception of or reaction to a stimulus that occurs without awareness or consciousness
  • submerged arc welding — a type of heavy electric-arc welding using mechanically fed bare wire with the arc submerged in powdered flux to keep out oxygen
  • substitution reaction — the replacement of an atom or group of atoms in a compound by another atom or group.
  • suction and curettage — a technique involving extraction of the fetus through a suction tube, used to perform abortions during the early stages of pregnancy.
  • sun protection factor — SPF.
  • supergranulation cell — one of a number of large convection cells in the photosphere and chromosphere of the sun, each having a diameter of 10,000–20,000 miles (16,000–32,000 km) and lasting longer than a day.
  • supplementary benefit — (formerly) an extra amount of money that is paid to someone by the government, in addition to their normal income. Replaced by income support in 1988
  • surface friction drag — the part of the drag on a body moving through a fluid that is dependent on the nature of the surface of the body
  • surface of projection — the surface upon which an image or a set of points is projected.
  • surface of revolution — a surface formed by revolving a plane curve about a given line.
  • sympathetic vibration — a vibration induced by resonance.
  • synchrotron radiation — electromagnetic radiation emitted by charged particles as they pass through magnetic fields.
  • systeme international — Système International d'Unités
  • take one's finger out — stop delaying or procrastinating
  • take someone prisoner — to capture and hold someone as a prisoner, esp as a prisoner of war
  • take under advisement — to consider carefully
  • tape operating system — (operating system)   (TOS) An IBM operating system for System 360, used in the early days around 1965 to support the IBM 360 model 30 et al. TOS was a predecessor to IBM's Disk Operating System. TOS died out really early as disks such as the 2311 and 2314 became common with the IBM 360 whereas thet had been a real luxury on the IBM 7090.
  • tartarian honeysuckle — an Asian honeysuckle, Lonicera tatarica, having fragrant, white to pink flowers.
  • teacher certification — official qualifications for educators
  • teleological argument — the argument purporting to prove the existence of God from empirical facts, the premise being that the universe shows evidence of order and hence design
  • temperature inversion — inversion (def 12).
  • tenure track position — a position or office that carries with it the opportunity to eventually obtain tenure or the right to permanent employment
  • terrestrial radiation — long-wave electromagnetic radiation in the form of heat emitted from the earth's surface and atmosphere.
  • tetrabromofluorescein — eosin (def 1).
  • the acting profession — actors considered as a group
  • the battle of britain — from August to October 1940, the prolonged bombing of S England by the German Luftwaffe and the successful resistance by the RAF Fighter Command, which put an end to the German plan of invading Britain
  • the birth of a nation — an American film (1915), directed by D. W. Griffith.
  • the central provinces — the Canadian provinces of Ontario and Quebec
  • the early renaissance — the period from about 1400 to 1500 in European, esp Italian, painting, sculpture, and architecture, when naturalistic styles and humanist theories were evolved from the study of classical sources, notably by Donatello, Masaccio, and Alberti
  • the joker in the pack — If you describe someone or something as the joker in the pack, you mean that they are different from the other people or things in their group, and can be unpredictable.
  • the man in the street — If you talk about the man in the street or the man or woman in the street, you mean ordinary people in general.
  • the moral high ground — If you say that someone has taken the moral high ground, you mean that they consider that their policies and actions are morally superior to the policies and actions of their rivals.
  • the press association — the national news agency for the United Kingdom and Ireland
  • the probation service — a criminal justice service that is mainly responsible for dealing with offenders by placing them under the supervision of a probation officer
  • the shipping forecast — a radio broadcast made by the BBC of weather reports and forecasts for the seas around the British Isles
  • the stars and stripes — the national flag of the United States of America, consisting of 50 white stars representing the present states on a blue field and seven red and six white horizontal stripes representing the original states
  • the stationery office — (in the UK) the company that supplies the civil service with all its office supplies, machinery, printing and binding, etc
  • theater of operations — the part of the theater of war, including a combat zone and a communications zone, that is engaged in military operations and their support.
  • therapeutic community — a group-based form of therapy for mental disorders, sometimes residential
  • thermal decomposition — Thermal decomposition is the process in which a chemical species breaks down when its temperature is increased.
  • thermal power station — a power station in which heat is converted into electricity
  • third-party insurance — insurance that compensates for a loss to a party other than the insured for which the insured is liable.
  • threatening behaviour — intimidation or intentional behaviour that causes another person to fear injury or harm
  • three-quarter binding — a binding in which the material used for the back extends further over the covers than in half binding.
  • throw one's hat at it — to give up all hope of getting or achieving something
  • ticker-tape reception — (mainly in New York) the showering of the motorcade of a distinguished politician, visiting head of state, etc, with ticker tape as a sign of welcome
  • tide-generating force — the difference between the force of gravity exerted by the moon or the sun on a particle of water in the ocean and that exerted on an equal mass of matter at the centre of the earth. The lunar tide-generating forces are about 2.2 times greater than are the solar ones
  • to be arrayed against — to be opposed to
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